Retention times of fifty one chlorobiphenyl congeners on seven narrow bore capillary columns coated with different stationary phases

Boer, Jacob de; Dao, Q. T.; Dortmond, R. van

doi:10.1002/jhrc.1240150409

Cited by 56 publications

(10 citation statements)

References 13 publications

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“…16 min static extraction at a density of 0.84 g/mL (371 bar) at 70 °C followed by 30 min dynamic extraction at the same density and temperature with a flow of 3 mL/min. The completeness of the extractions was examined using sequential extractions with the above-mentioned conditions.…”

Section: Methodsmentioning

confidence: 99%

Independent Comparison of Soxhlet and Supercritical Fluid Extraction for the Determination of PCBs in an Industrial Soil

Soren¹,

Johansson²,

Wunderli³

et al. 1995

Anal. Chem.

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An independent comparison between supercritical fluid extraction (SFE) and Soxhlet extraction methods was conducted as part of a certification of PCB congeners in industrial soil. The study was performed in the framework of the PCB group for the Measurements and Testing Program (former BCR) under the Commission of the European Union. It involved 21 selected and independent laboratories experienced in congener-specific PCB analysis. The comparison was performed using both interlaboratory and intralaboratoiy data. SFE was performed independently by three laboratories, and the obtained data showed that SFE is a very competitive alternative in terms of both accuracy and precision. The soil was certified for eight PCB congeners ranging from 7.0 to 137 //g/g with interlaboratory RSDs of 9-13% using all but two (out of 34) individual results from the SFE group.In recent years, supercritical fluid extraction (SFE) has gained increased interest because of the potential for reducing (1) the use of large amounts of hazardous organic solvents and (2) the work connected with conventional methods.1-8 Unfortunately, but also understandably, early SFE methods were developed using spiked or fortified samples on a variety of homemade instruments.9-11 The results obtained indicated that SFE had a very

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Section: Methodsmentioning

confidence: 99%

Independent Comparison of Soxhlet and Supercritical Fluid Extraction for the Determination of PCBs in an Industrial Soil

Soren¹,

Johansson²,

Wunderli³

et al. 1995

Anal. Chem.

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“…In line with Mullin et al [78] and Duinker et al [81], de Boer et al [94] have described retention times for 51 CBs in 7 narrow bore capillary columns. Larsen et al [95] analyzed 140 CB congeners in technical mixtures using five narrow bore columns.…”

Section: Congener-specific Analysismentioning

confidence: 63%

Non- and Mono-ortho Chlorinated Biphenyls

Kannan¹

2000

Volume 3 Anthropogenic Compounds Part K

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Polychlorinated biphenyls (PCBs) are a complex mixture, identified in every component of the global ecosystem. If potential toxicity, environmental prevalence, and potential risk to humans and wildlife are considered, non-and mono-ortho substituted chlorinated biphenyls become extremely important. They resemble 2,3,7,8-tetrachloro dibenzo-p-dioxin (TCDD) in their biological action, causing hepato-, immuno-, reproductive, and dermal toxicities, and inducing mixed function oxidase (MFO) enzymes. This is the basis behind TCDD toxic equivalency (TEQs) as an approach towards risk assessment. Improvements in chromatographic techniques have yielded an array of analytical methods for these congeners that resulted in the determination of coplanar non-ortho and mono-ortho CBs in air, water, soil, and in organisms. Long range trans-hemispheric transportation of these substances in air and ocean currents have been demonstrated. Their contents in commercial PCBs have been studied and their formation during incineration is shown. Long term studies in river sediments demonstrate reductive dechlorination. PCB clearance from animals occurs both by non-metabolic and metabolic routes. Their flux in air, water, and sediments is estimated. OH reactions in the atmosphere is proposed as a principal source of loss along with permanent burial in marine and fresh water sediments.

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“…About half of the participants used different columns to quantify the non-ortho and the mono-ortho CBs, The majority of the columns used were nonpolar, with dimethyl-or phenyl/dimethylpolysiloxane stationary phases. In only a few cases were more polar columns used because of their potential to improve the separation of several problematic CBs such as CB 153,132, and 105 (24); 138 and 163 (25); and 110 and 77 (12). However, because most participants used carbon chromatography or pyrenyl-coated HPLC stationary phases (Table 2), the problems of GC co-elution were easily overcome by isolating the non-ortho and mono-ortho congeners into separate fractions prior to analysis.…”

Section: Chromatographymentioning

confidence: 99%